ASTM D2425 for Hydrocarbon Types in Middle Distillates by Mass Spectrometry
12. Precision and Bias
12.1 The precision of this test method as obtained by statistical examination of interlaboratory test results on samples having the composition given in Table 6 is as follows:
12.1.1 Repeatability - The difference between successive test results obtained by the same operator with the same apparatus under constant operating conditions on identical test material, would be in the long run, in the normal and correct operation of the test method, exceed the values shown in Table 7 only in one case in twenty.
12.1.2 Reproducibility - The difference between two single and independent results, obtained by different operators working in different laboratories on identical test material, would in the long run, in the normal and correct operation of the test method, exceed the values shown in Table 7 only in one case in twenty.
NOTE 7 - If samples are analyzed that differ appreciably in composition from those used for the interlaboratory study, this precision statement may not apply.
NOTE 8 - The precision for this test method was not obtained in accordance with RR:D02-1007.
12.2 Bias - Bias cannot be determined because there is no acceptable reference material suitable for determining the bias for this test method.
13. Keywords
13.1 hydrocarbon types; mass spectrometry; middle distillates
